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Self-employed Britons face an increase in their National Insurance contributions as the Chancellor aims to tackle what he said was the unfair burden on people in employment.

The 9pc levy on the profits of the self-employed will rise to 10pc next year and 11pc in 2019, raising more than £2bn in extra tax revenue in the current Parliament.

Philip Hammond said in his first Budget that he would act to address a multibillion-pound shortfall in National Insurance, which is due to expand as more Britons choose to work for themselves. A preliminary review had found that lower rates of tax relative to employment were driving the trend, he added.